Actual and Nominal Sizes
Blocks come in both heavyweight and lightweight materials with full and half length sizes. The three-core block can also be obtained as two-core blocks. The figure below illustrates some of the typical sizes and shapes of concrete blocks.
Type of concrete blocks
Types of concrete blocks (continued)
- Stretcher : A stretcher block is the most commonly used block in construction. It is laid with its length parallel to the face of the wall.
- Corner : A corner block is used for corners at simple window and door openings.
- Double Corner or Pier : A double-corner or pier block is used for constructing piers pilasters or for any other purpose where both ends of the block would be visible.
- Bull Nose : A bull-nose block serves the same purpose as a corner block, but it is used where round corners are desired.
- Jamb : A wood-sash jamb block is used with a stretcher and a corner block around elaborate window openings. The recess in the block allows room for the various casing members, as in a double-hung window.
The most common block
The most common concrete block is the hollow, load-bearing stretcher block, which is 8 by 8 by 16 inches nominal size, but 7 5/8 by 7 5/8 by 15 5/8 inches actual size. The heavyweight load-bearing stretcher block weighs from 40 to 50 pounds.
Hollow load-bearing stretcher block
NOTE: The cores taper toward the top of the block, providing a wider face shell. Always lay this block with the wider face up to allow for a greater area on which to lay a bed of mortar.
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